The effect of a perturbation in the diameter of a circular microchannel on critical heat flux (CHF) is explored across a variety of predictive CHF correlations, and an optimum rate of diameter expansion is sought. It is demonstrated that a nonzero diameter expansion necessarily improves performance under several criteria for critical heat flux, and an optimum expansion parameter exists for many of these criteria. CHF relations are seen to follow a few distinct types, and those relations which contemplate effects which may directly influence CHF, such as pressure and phase velocity, tend to better reflect the experimentally demonstrated effect of the perturbation on the diameter of the microchannel.

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